Association Of 24-hour Activity Behaviors And Cardiorespiratory Fitness In Chinese Adolescents: Compositional Data Analysis

Previous studies have largely explored the effects of 24-hour activity behaviors (physical activity, sedentary time and sleep) on health-related problems in isolation, ignoring the combined effects of each part. PURPOSE: This study was based on Compositional Data Analysis to investigate the relationship between 24-hour activity behaviors and cardiorespiratory fitness (CRF) among Chinese adolescents without the influence of multi-collinearity which was caused by the restriction of "constant sum". METHODS: The time (minutes) of light-intensity physical activity (LPA), moderate-intensity physical activity (MPA), Vigorous-intensity physical activity (VPA), sedentary and sleep were evaluated using accelerometry (ActiGraph GT3X+). CRF was estimated by 20-m shuttle run test. T-test was used to compare the differences in activity behaviors between boys and girls. The Compositional Data Analysis was conducted to determine the effect of each part of activity behaviors on CRF. Age, height and weight were used as covariates. RESULTS: 111 participants (boys: 39.6%) completed this cross-sectional study, with an average age of 13.50 ± 0.59 years. Compared with girls, boys had longer LPA, MPA and VPA time(239.35 ± 77.90 vs. 198.94 ± 52.57, p = 0.01; 38.08 ± 15.33 vs. 28.20 ± 9.11, p = 0.00; 22.13 ± 13.07 vs. 11.56 ± 5.39, p = 0.00 respectively) and shorter sedentary time (555.02 ± 115.37 vs. 607.40 ± 69.62, p = 0.04). The Compositional Data Analysis showed there was a strong statistically positive correlation between VPA and CRF in the group of boys only (β = 17.2815, p = 0.001). CONCLUSIONS: Compared with girls, boys have reached the recommendation of 60 minutes of moderate to vigorous-intensity physical activity per day. Considering the 24-hour activity behaviors, VPA was more meaningful to enhance CRF for adolescent boys. FUNDING:This Study was supported by the Key Project for Education of the National Social Science Foundation of China (ALA190015).